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https://issues.apache.org/jira/browse/MNG-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ben Caradoc-Davies updated MNG-6323:
------------------------------------
Description:
Maven 3.5.2 multithreaded builds experience a deadlock not seen with Maven
3.5.0.
To reproduce the issue, clone GeoServer:
{noformat}
git clone https://github.com/geoserver/geoserver.git
cd geoserver
{noformat}
Build GeoServer community modules with:
{noformat}
mvn -f src/community/pom.xml -B -T4 -U -Prelease -PcommunityRelease -DskipTests
clean install
{noformat}
Builds that normally take 2-4 minutes instead experience long hangs. {{jstack}}
output (attached) suggests a deadlock (two different hangs attached). Some of
the locks are in {{TIME_WAIT}} and eventually the build completes after 30-45
minutes, but this is enough to cause builds on Travis to be killed for their
failure to output for ten minutes. (Travis upgraded to Maven 3.5.2 a week ago.)
I have only seen the failures with -U. The hang does not occur in
single-threaded builds. There are no "*.lock" files in the local repository
during the hang so the deadlocks are not mediated by the filesystem. CPU
utilisation is zero suggesting a deadlock not a livelock.
See also discussion on the geoserver-devel mailing list:
http://osgeo-org.1560.x6.nabble.com/Travis-failures-started-with-new-trusty-images-td5346836.html
was:
Maven 3.5.2 multithreaded builds experience a deadlock not seen with Maven
3.5.0.
To reproduce the issue, clone GeoServer:
{noformat}
git clone https://github.com/geoserver/geoserver.git
cd geoserver
{noformat}
Build GeoServer community modules with:
{noformat}
mvn -f src/community/pom.xml -B -T4 -U -Prelease -PcommunityRelease -DskipTests
clean install
{noformat}
Builds that normally take 2-4 minutes instead experience long hangs. {{jstack}}
output (attached) suggests a deadlock (two different hangs attached). Some of
the locks are in {{TIME_WAIT}} and eventually the build completes after 30-45
minutes, but this is enough to cause builds on Travis to be killed for their
failure to output for ten minutes. (Travis upgraded to Maven 3.5.2 a week ago.)
I have only seen the failures with -U. The hang does not occur in
single-threaded builds. There are no "*.lock" files in the local repository
during the hang so the locks are not mediated by the filesystem. CPU
utilisation is zero suggesting a deadlock not a livelock.
See also discussion on the geoserver-devel mailing list:
http://osgeo-org.1560.x6.nabble.com/Travis-failures-started-with-new-trusty-images-td5346836.html
> Deadlock in multithreaded dependency resolution
> -----------------------------------------------
>
> Key: MNG-6323
> URL: https://issues.apache.org/jira/browse/MNG-6323
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.5.2
> Reporter: Ben Caradoc-Davies
> Attachments: geoserver-community-maven-hang-jstack-2.txt,
> geoserver-community-maven-hang-jstack.txt
>
>
> Maven 3.5.2 multithreaded builds experience a deadlock not seen with Maven
> 3.5.0.
> To reproduce the issue, clone GeoServer:
> {noformat}
> git clone https://github.com/geoserver/geoserver.git
> cd geoserver
> {noformat}
> Build GeoServer community modules with:
> {noformat}
> mvn -f src/community/pom.xml -B -T4 -U -Prelease -PcommunityRelease
> -DskipTests clean install
> {noformat}
> Builds that normally take 2-4 minutes instead experience long hangs.
> {{jstack}} output (attached) suggests a deadlock (two different hangs
> attached). Some of the locks are in {{TIME_WAIT}} and eventually the build
> completes after 30-45 minutes, but this is enough to cause builds on Travis
> to be killed for their failure to output for ten minutes. (Travis upgraded to
> Maven 3.5.2 a week ago.)
> I have only seen the failures with -U. The hang does not occur in
> single-threaded builds. There are no "*.lock" files in the local repository
> during the hang so the deadlocks are not mediated by the filesystem. CPU
> utilisation is zero suggesting a deadlock not a livelock.
> See also discussion on the geoserver-devel mailing list:
> http://osgeo-org.1560.x6.nabble.com/Travis-failures-started-with-new-trusty-images-td5346836.html
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